I agree with@ucbalumnus . Math courses do not have a high workload. The bulk of my time is spent doing CS homework and labs, at music rehearsals, and reading and writing for whatever writing-intensive class I might have (believe it or not, that’s my dance class this semester). My math homework is one of the least time consuming things I do.
OP, I think you need to sit down with an academic advisor for the math at your school. The courses you are trying to take together don’t make sense. I don’t think you can do that because of the prereqs. An advisor might be able to help you figure out how to plan your courses better.